//
//  DeviceUtil.swift
//  SwiftStudyDemoAll
//
//  Created by BINGO on 2019/5/12.
//  Copyright © 2019 mrlong. All rights reserved.
//

import Foundation
class DeviceUtil {
    /// 屏幕宽度
    func screenWidth() -> CGFloat {
        return UIScreen.main.bounds.size.width
    }
    
    /// 屏幕高度
    func screenHeight() -> CGFloat {
        return UIScreen.main.bounds.size.height
    }
    
    /// 获取设备版本号
    func deviceName() -> String {
        var systemInfo = utsname()
        uname(&systemInfo)
        let machineMirror = Mirror(reflecting: systemInfo.machine)
        let identifier = machineMirror.children.reduce("") { identifier, element in
            guard let value = element.value as? Int8, value != 0 else { return identifier }
            return identifier + String(UnicodeScalar(UInt8(value)))
        }
        switch identifier {
        case "iPod5,1":                                 return "iPod Touch 5"
        case "iPod7,1":                                 return "iPod Touch 6"
        case "iPhone3,1", "iPhone3,2", "iPhone3,3":     return "iPhone 4"
        case "iPhone4,1":                               return "iPhone 4s"
        case "iPhone5,1", "iPhone5,2":                  return "iPhone 5"
        case "iPhone5,3", "iPhone5,4":                  return "iPhone 5c"
        case "iPhone6,1", "iPhone6,2":                  return "iPhone 5s"
        case "iPhone7,2":                               return "iPhone 6"
        case "iPhone7,1":                               return "iPhone 6 Plus"
        case "iPhone8,1":                               return "iPhone 6s"
        case "iPhone8,2":                               return "iPhone 6s Plus"
        case "iPhone9,1":                               return "iPhone 7 (CDMA)"
        case "iPhone9,3":                               return "iPhone 7 (GSM)"
        case "iPhone9,2":                               return "iPhone 7 Plus (CDMA)"
        case "iPhone9,4":                               return "iPhone 7 Plus (GSM)"
            
        case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
        case "iPad3,1", "iPad3,2", "iPad3,3":           return "iPad 3"
        case "iPad3,4", "iPad3,5", "iPad3,6":           return "iPad 4"
        case "iPad4,1", "iPad4,2", "iPad4,3":           return "iPad Air"
        case "iPad5,3", "iPad5,4":                      return "iPad Air 2"
        case "iPad2,5", "iPad2,6", "iPad2,7":           return "iPad Mini"
        case "iPad4,4", "iPad4,5", "iPad4,6":           return "iPad Mini 2"
        case "iPad4,7", "iPad4,8", "iPad4,9":           return "iPad Mini 3"
        case "iPad5,1", "iPad5,2":                      return "iPad Mini 4"
        case "iPad6,7", "iPad6,8":                      return "iPad Pro"
        case "AppleTV5,3":                              return "Apple TV"
        case "i386", "x86_64":                          return "Simulator"
        default:                                        return identifier
        }
    }
    
    /// 获取iPhone名称
    func iphoneName() -> String {
        return UIDevice.current.name
    }
    
    /// 获取app版本号
    func appVersion() -> String {
        return Bundle.main.infoDictionary!["CFBundleShortVersionString"] as! String
    }
    
    /// 获取电池电量
    func batteryLevel() -> CGFloat {
        return CGFloat(UIDevice.current.batteryLevel)
    }
    
    /// 当前系统名称
    func systemName() -> String {
        return UIDevice.current.systemName
    }
    
    /// 当前系统版本号
    func systemVersion() -> String {
        return UIDevice.current.systemVersion
    }
    
    /// 通用唯一识别码UUID
    func UUID() -> String {
        return (UIDevice.current.identifierForVendor?.uuidString)!
    }
    
    /// 获取当前设备IP
    func deviceIP() -> String? {
        var addresses = [String]()
        var ifaddr : UnsafeMutablePointer<ifaddrs>? = nil
        if getifaddrs(&ifaddr) == 0 {
            var ptr = ifaddr
            while (ptr != nil) {
                let flags = Int32(ptr!.pointee.ifa_flags)
                var addr = ptr!.pointee.ifa_addr.pointee
                if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                    if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {
                        var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                        if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                            if let address = String(validatingUTF8:hostname) {
                                addresses.append(address)
                            }
                        }
                    }
                }
                ptr = ptr!.pointee.ifa_next
            }
            freeifaddrs(ifaddr)
        }
        return addresses.first
    }
    
    /// 私有方法
    private func blankof<T>(type:T.Type) -> T {
        let ptr = UnsafeMutablePointer<T>.allocate(capacity: MemoryLayout<T>.size)
        let val = ptr.pointee
        ptr.deinitialize(count: 0)
        return val
    }
    
    /// 获取总内存大小
    func totalRAM() -> Int64 {
        var fs = blankof(type: statfs.self)
        if statfs("/var",&fs) >= 0{
            return Int64(UInt64(fs.f_bsize) * fs.f_blocks)
        }
        return -1
    }
    
    /// 获取当前可用内存
    func availableRAM() -> Int64 {
        var fs = blankof(type: statfs.self)
        if statfs("/var",&fs) >= 0{
            return Int64(UInt64(fs.f_bsize) * fs.f_bavail)
        }
        return -1
    }
    
    /// 获取电池当前的状态，共有4种状态
    func batteryState() -> String {
        let device = UIDevice.current
        if device.batteryState == UIDevice.BatteryState.unknown {
            return "unknown"
        } else if device.batteryState == UIDevice.BatteryState.unplugged {
            return "unplugged"
        } else if device.batteryState == UIDevice.BatteryState.charging {
            return "charging"
        } else if device.batteryState == UIDevice.BatteryState.full {
            return "full"
        }
        return ""
    }
    
    /// 获取当前语言
    func deviceLanguage() -> String {
        return Locale.preferredLanguages[0]
    }
}
